<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        *{
            box-sizing: border-box;
        }
        .container{
            display: flex;
            height: 400px;

        }
        .center{
            background-color: aqua;
            flex: 1;
        }
        .left,
        .right{
            background-color: pink;
            width: 200px;
            flex-shrink: 0;
        }
    </style>
</head>
<body>
    <!-- 三列圣杯布局:布局结构：左右两侧是固定宽度的边栏，而中间部分则是宽度自适应的主要内容区域。 -->
    <div class="container">
        <div class="left">左侧</div>
        <div class="center">中间内容</div>
        <div class="right">右侧</div>
    </div>


</body>
</html>